Are you talking about nighttime humidity? because now the recommended Veiled care is actually low during the day, and up to 100 at night... oh and also for the op. Stop misting during the day! i know you did not know this just wanted to be clear, i am seriously trying to not come off as rude so sorry if i am. im in a hurry. but id say mist well twice daily for now till you can hopefully get a fogger... mist in the morning early, and like a half hour or hour before lights off. Also, he probably does have RI, in which case you should go to the vet ASAP so they can medicate him. try to find a reptile vet, and preferably one that specializes in chameleons. good luck, i hope he recovers